LM1771TMM/NOPB

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LM1771TMM/NOPB is a switching voltage regulator which is categorized under PMIC (Power Management Integrated Circuit) – Voltage Regulators – DC DC Switching Controllers. It is ideal for providing regulated output from an unregulated input. It is made up of many functional blocks that work together to provide the needed output depending on the application like battery chargers and regulators, lamp drivers, SMPS, audio systems, car battery chargers, consumer electronic circuits and other industrial application circuits.

A typical voltage regulator using the LM1771TMM/NOPB circuit can be divided into three main parts – the input stage, the controller stage and the output stage.

The input stage takes an unregulated voltage source as an input. This input voltage is conditioned by a rectifier and voltage regulator so that the voltage received at the input of the controller is regulated. This regulated input then passes through the EMI filter towards the internal regulator stages.

The LM1771TMM/NOPB switches on and off the output stage according to the input voltage in order to maintain a constant output voltage. The frequency of this action is defined by a clock oscillator circuit. This is done by alternately switching on and off the two N-Channel MOSFETs in the output stage of the circuit.

The output stage can either be a buck or boost converter type. In the buck converter, the MOSFET drains the power from the input, thereby resulting in a lower regulated output voltage. In the boost converter, the MOSFET increases the voltage of the input, resulting in a higher regulated output voltage. This can be done by adjusting the duty cycle of the MOSFETs.

The LM1771TMM/NOPB is designed to shut down the entire system if the output voltage reaches a certain low or high voltage level, thus protecting the system from power failure or overvoltage.

The LM1771TMM/NOPB employs a number of protection features such as under volt lockouts, current limit protection, load disconnect, and over temperature protection. These protection features ensure safety and reliability of the circuit during long term operation and extreme environmental conditions.

The LM1771TMM/NOPB is a switching voltage regulator which is suitable for a wide range of applications and can deliver the required regulated output from any unregulated input. It incorporates a number of protection features to maintain the reliability of the circuit and provides cost efficient and energy saving solution.

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